Designing Efficient MoS₂/g‐C₃N₄ Hybrid Photocatalysts by Regulating the Interlayer Spacing of MoS₂

Abstract

Songwei Tang, [a, b] Sibi Liu, [a, b] and Xuanhua Li* [a, b] g-C 3 N 4 as an appealing photocatalyst has received much attention due to its abundance, nontoxicity, and unique photoelectric properties. However, bare g-C 3 N 4 usually suffers from restricted light absorbance and serious carriers recombination.The key issue of boosting the photocatalytic performance of the g-C 3 N 4 lies in constructing hybrids for better optical and electrical effects. Here, the MoS 2 with different interlayer spacing is integrated with g-C 3 N 4 via calcination and hydrothermal methods to form the high-performance MoS 2 /g-C 3 N 4 hybrid photocatalyst. Optimized energy-band alignment with g-C 3 N 4 is realized through regulating the interlayer spacing of MoS 2 , achieving improved carriers separation efficiency. In addition, the broadband absorption and rich active sites are also achieved here. As a result, the rationally designed MoS 2 /g-C 3 N 4 composite (the MoS 2 interlayer spacing: 1.02 nm) exhibits the dominant photocatalytic performance (hydrogen production rate: 1281 μmol/h/g). This work opens a new road to realize a proper energy-band alignment with g-C 3 N 4 for high performance photocatalytic activity.

Facile One‐Pot Synthesis and Enhanced Photocatalytic Performances of Ternary Metal Sulfide Composite g‐C3N4/Cu3SnS4

“…A number of g-C 3 N 4 heterojunctions doped by the binary metal sulfides used as photocatalysts in the photodegradation of organic pollutants have been reported. The examples include g-C 3 N 4 /CuS, [17] g-C 3 N 4 /CdS, [18,19] g-C 3 N 4 /ZnS, [20] MoS 2 /g-C 3 N 4 , [21] g-C 3 N 4 /CdS/CuS, [22] g-C 3 N 4 /ZnS/CuS, [23] and g-C 3 N 4 /PtS. [24] Recently, the g-C 3 N 4 heterojunctions doped by ternary metal sulfide, which were characterized by catalytic activation of bimetallic sites, had become interesting in constructing new heterojunctions.…”

Bromoargentate/g-C3N4 heterojunction by in situ growth: 2-D bromoargentate framework with a transition metal complex linker and cocatalyst for enhanced photocatalytic activity via g-C3N4 hybrid

“…The 1 /g-C 3 N 4 heterojunction was prepared in situ by synthesis of 1 in the presence of g-C 3 N 4 powder. In the FT-IR spectrum of the 1 /g-C 3 N 4 heterojunction, the absorption peaks at 805, 1233, 1314, 1395, and 1626 cm −1 are attributed to the typical stretching mode for the CN-heterocyclic system of g-C 3 N 4 , 18 a ,23 while the main absorption bands of 1 are almost unchanged (Fig. S1†).…”

“…S1†). A broad peak at 27.3° appeared in the PXRD pattern of the 1 /g-C 3 N 4 heterojunction, which was indexed as the characteristic peak of g-C 3 N 4 , 18 a ,23,24 while the peak positions of 1 were unchanged (Fig. 1).…”

“…14 c ,15 As a 2-D polymeric semiconductor, g-C 3 N 4 can construct various cocatalysts with well-matched energy levels of other semiconductors to form heterostructures. Many g-C 3 N 4 -based composites with different components and compositions have been prepared by loading metals, 16 metal oxides, 17 or metal sulfides 18 on the surface of g-C 3 N 4 layers. In recent years, the synthesis of g-C 3 N 4 -based semiconductor cocatalysts by loading metal organic frameworks (MOFs) has attracted increasing interest.…”

Recent Progress on Photoelectrochemical Water Splitting of Graphitic Carbon Nitride (g−CN) Electrodes

“…Apart from the CdS modification, 2D−layered transition metal sulphide (MoS 2 ) has recently become an ideal co-catalyst on account of its high mobility, low cost, and narrow band gap (1.2–1.9 eV) [ 212 , 213 ]. Planar growth of MoS 2 above the g−CN surface is realized due to the well-matched lattice and the similar layered structure [ 214 , 215 ].…”